Wrench



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Specification. of lLetters Patent.

Patented 11 cc. ti, 12321..

application filed January 52 1-, 1921. Serial No. 439,557.

To a-ZZ whom it may concern.

Be it known that l, REGINALD Lrnv snnrv, a subject of the King; oi Great Britain, residing in the city of Hamilton, county oi? i Ventworth, Province of Ontario"Canada, have invented certain new and nsetnl l1nmovements in Wrenches, oi. which the fob lowing is the specification. j

My invention relates to improvements in wrenches and the object of the invention is to provide for very rapid and convenient adjustment of the wrench to suit widely varying sizes of work.

My invention consists of the ordinary monkey wrench in which the movable j aw is operated by a worm carried thereby and whlch engages a suitable rack upon the shank of the wrench, the worm being mounted in a bracket which is pivotally mounted in the movable jaw whereby the worm may be swnnp; laterally out of operative engagement with the rack of the shank to permit free movement ct said. movable jaw, all as hereinafter more particularly described and illustrated in the accompanying; drawings in which Figure 1 is a side view of a wrench constructed according to myinvention, a portion of the movable jaw being broken away to show the construction, the section being; through the centerof the Fig. 2 is a transverse section on the line 2, 2 of 1 looking in the direction of the arrows, the worm being shown swung to one side out of operative engagement with the shank.

Like characters of reference indicate corresponding parts in the dii'lerentiviews.

1 is the shank or handle portion of the wrench which carries the fixed jaw 2 at one end thereof.

3 is the movable jaw which is provided with the passageway a through which the shank 1 extends.

The inner face oi the shank with the rack 5.

The body of the jaw 3 is provided with a rectangular opening 6 for a purpose as will presently appear.

is a bracket which is mounted in the movable jaw 3 and is capable of being; swung laterally in the opening 6 about the axis m-aa The upper end of the bracket isjour- 1 is provided naled in the movable jaw by means of the pin 8 engaging; a suitable bearing orifice in the jaw.

The lower end 01 the bracket is journaled in thejaw by means 015' the pin 9 which extends freely through the orifice 10 in the. jaw and has its inner end threaded at 11 to engage a correspondingly threaded. orifice in the bracket 7.

12 is a worm which is rotatably mounted in the bracket 7. The upper end oi the wormcarries a journal pin 13 which en- ,g'ag'es a bearing orifice in the bracket 7.

The lower end of the worm isjournaled in the bracket by means of the pin 14- which extends :t'reelythrough the critics 15 in the bracket and has its inner end threaded 16 to engage a. correspondingly threaded orifice in the worm.

The movable jaw is provided with a passageway 17. Tnto 'this passageway is inserted the locking ball 18 which projects partially through the lower end and is adapted to engage the dimple 19 on the top face of the bracket 7 when the bracket is .in the positionshown in Fig. 1. The

lower end oi the passageway 17 is slightly restricted to prevent the ball 18 from passinn; entirely through.

The coil spring 19 is located in the passageway 17 above the ball 18 and is held in position by the screw cap 20 which is threaded into the upper end of the passageway l7.

The construction and operation of my device is as follows The fixed jaw 1 and the shank with the rack 5 are of standard construction, commonly used on wrenches of this type.

Considering the parts in the position illus trated in Fig. 1, it will be evident that the jaw 3 is locked and can only be moved along the shank by rotating the worm. Also in this position the ball 18 is engaging the dimple 19 in the bracket 7 so that the worm is held in the correct operative engagement with the rack 5.

Tn this positionthe jaw 3 may be adjusted by means of the worm to tightly grip the work.

When it is desired to use the wrench on work requiring a different jaw opening, instead of having to move the jaw 3 all the way by means of the worm, which involves a considerable waste of time, the bracket 7 may be swung to one side about the axis ma: (see Fig. 1).

This position is shown in Fig. 2 and it will be seen that the'worm is now entirely out of engagement with the rack 5 on the shank sov that the jaw 3 may be freely moved toany desired position. In order to tighten the j awsupon the work,the bracket is swung back into the position in Fig. 1 and further adjustment done by means of the worm.

The pins 9 and 1 with their threaded in ner ends permit of convenientassembling or the wrench.

Ordinarily on wrenches of this type, the movablej aw can only be moved by means of the worm and it is with a view of enabling more rapid andconvenient adjustment that my improvements have been devised. This improvement will be particularly valuable in the case oi large wrenches in which the movable jaw has a very considerable length of travel along'the shank. w

I am aware that various methods of accomplishing this end have been tried but without success since they have interfered with the reliability oiithe'grip of the jaws and have rcndered'the movable jaw liable to slip in certain positions of the worm.

One method used consisted in providing a longitudinal groove in the worm so that when this groove registered with the rack the movable aw was free for rapid adjustment; This was subject to the above dis advantage however.

While I have illustrated one specific form in which my invention may be made, it is to be understood that various alterations could be made. in the exact details of construction without departing from the spirit of my invention. For instance other meth ods of mounting the bracket 7 and worm 12 might be used in place of the pins 9 and 14: as illustrated. Also the opening 6 need not be rectangular.

From the foregoing it will be seen that I have devised valuable improvements in. wrenches which will make their use more convenient and also result in a considerable saving of time in making adjustments.

What I claim as my invention is:

A wrench comprising a shank portion, a fixed aw carried integrally thereby, a 11\()\'- able jaw slidably mounted upon the shank, a longitudinally disposed rack on the shank, the movable jaw having a rectangular transverse opening therein, a bracket having avertical portion and an upper and lower horizontal arm extending from its upper and lower end respectively, the bracket being pivotally mounted within the rectangular opening in the movable jaw and being capable of being swung laterally therein about its pivot points, the lower pivotal eonnection of the bracket comprising a screw member whereby the bracket is detachably mounted in the movable jaw, a worm rotatably mounted in the bracket and co-acting with the rack, the top face of the upper horizontal arm of the b acket provided with a dimple, and a spring held ball carried in an orifice in the movable aw and adapted to engage the dimple for locating the worm and rack in their engaged positions.

REGINALD LUMSDEN.

Witnesses:

JOHN G. HAYWARD, NoRnnN Comes. 

